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Hi, Can someone shed any light to why is my sony 55xd8599 tv is not coming on and the red light is flashing 6 times
More than likely an internal component in your TV has failed and will need replaced, probably the mainboard.
click on this link to a Sony article on how to troubleshoot the LED flashing on their TVs.
https://www.sony.co.uk/electronics/support/articles/00011057
After trying the various resets and still the TV won't turn on then you will need it serviced/ repaired.
As it is a 2016 model it is most likely out of warranty and repair could be quite expensive.
Fancy a new telly, the 2022 models from most manufacturers are now in the shops.
Thanks for your message, very useful.
I was hoping that there was a quick fix/reboot or something like that as everywhere I looked prior to posting my question here said/showed the same as you with a hardware/component issue.
Yes sure, it might be beyond economical repair, looks like i need a new one.
RED LED blinking count for your Model:
6x
Backlight failure [BACKLIGHT] or LED driver failure/LED voltage protection